SEARCH Articles Figures Tables Configuration pentad Methyl pentads NMR pentads Pentad distribution Pentad epimerized isotactic Pentad level Pentad observed probabilities Pentad regiosequence Pentad relationships Pentad resonance Pentad sequences Pentad sequences copolymerization Pentad spectra Pentads, Hexads, Heptads, and Octads Pentads, structural feature Polypropylene pentads Racemic pentad configuration